The program of the events of August in Ferrara and surroundings is available for downloading here
Main events:

Ferrara Buskers Festival
from August  20 to 28 
Music and entertainment in the historical centre of Ferrara

Ferragosto in Ferrara
from August 14 to 16
Fireworks and events

Saporidimare 2011
until September 2
in Comacchio and along the coast